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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Dec 2013 (Wednesday) 18:31
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manual focus ?

 
Mtk
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Dec 25, 2013 18:31 |  #1

Hey everyone.
I have a question about what they mean when they say it will only manually focus. I have a 7d with a 100-400 5.6 and would like to get a 1.4 extender but they say it will not AF. Now when they say it will not AF do they mean I can only focus by using the focus ring on the lens or does it mean the 19 point af will not work but the manual center spot will focus when you half press the shutter?
Hope that makes sense
Thanks


Canon 7D, Canon 100-400 F4/5.6 ISL Canon EF-S- 10-22

  
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kin2son
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Dec 25, 2013 18:59 |  #2
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You can only focus by using the focus ring, half pressing the shutter does nothing.

Having said that, Tamron TC will AF albeit slow and unreliable.


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BDKR
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Dec 25, 2013 19:16 as a reply to  @ kin2son's post |  #3

There are two possibilities:

A) Electrical- the teleconverter may lack the capability of transmitting the focus commands and receive the information from the lens for focus confirmation, making it necessary to take AF out of the loop by selecting MF on the lens.

B) The max aperture of your lens is 5.6, and the 7D has a tough time discerning an edge with which to determine focus at apertures smaller than 5.6, and when you put a teleconverter on that or any other lens, the max aperture gets smaller. If I put my Canon 2XII converter on my 70-200 f/2.8L IS, the max aperture is 5.6 as it is a 2x converter. When you employ a TC, there are two downsides: Speed of the glass and loss of Image Quality, no matter whose TC you use. My 7d has a problem autofocusing at apertures smaller than 55.6, although the spec says it should be able to AF at f/8. It is a light issue and the AF sensor being able to find an edge or high contrast area which to focus on.

Hope it helps.


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n1as
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Dec 25, 2013 19:29 |  #4

You can only focus by manually turning the focus ring on the lens. I do not know if the AF focus points will even register and indicate when you have achieved focus. I suspect not.

Unfortunately the 7D focus screen is not accurate enough to support reliable manual focus.

You either need a longer lens or a different body.


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Mtk
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Dec 25, 2013 19:31 |  #5

Thank's for the info.
It just has confirmed what I have known about the set up but was not positive what they meant when they said manual focus. I mostly shoot using a single focusing spot that the camera call's manual. Anyway thanks for the info


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MalVeauX
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Dec 25, 2013 20:24 |  #6

Mtk wrote in post #16553760 (external link)
Hey everyone.
I have a question about what they mean when they say it will only manually focus. I have a 7d with a 100-400 5.6 and would like to get a 1.4 extender but they say it will not AF. Now when they say it will not AF do they mean I can only focus by using the focus ring on the lens or does it mean the 19 point af will not work but the manual center spot will focus when you half press the shutter?
Hope that makes sense
Thanks

Heya,

Yeap, turn the ring, focus like it doesn't have a motor.

I actually do a lot of manual focus with my lenses. Sometimes you have to, to get your shot. Especially if trying to shoot through stuff for an interesting composition. Like, focusing on a bird, through some limbs. I do a lot of manual focus to infinity on my wide lenses too, and just fire away.

It's great actually if you get used to it and build your skill on it's use.

Very best,


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Littlefield
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Dec 25, 2013 21:04 |  #7

Mtk wrote in post #16553832 (external link)
Thank's for the info.
It just has confirmed what I have known about the set up but was not positive what they meant when they said manual focus. I mostly shoot using a single focusing spot that the camera call's manual. Anyway thanks for the info

Use manual focus with Live view on a tripod.




  
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killwilly
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Dec 26, 2013 02:10 |  #8

Littlefield wrote in post #16553962 (external link)
Use manual focus with Live view on a tripod.


+1 :)


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hollis_f
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Dec 26, 2013 04:48 |  #9

Littlefield wrote in post #16553962 (external link)
Use manual focus with Live view on a tripod.

Or, use LiveView with auto-focus. It will be slow, but it should work.


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manual focus ?
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